BMW E9 3.0CS M30 3.0L

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Prosport Performance Mini Cat CEL Fix Adapter - 90 Degrees - BMW
Prosport Performance - Corporate Logo
Part#: PSO2CEL-90
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This O2 cel fix actually has a miniature catalytic converter built inside and will help get rid of that annoying check engine light you get after modifying your exhaust or removing your catalytic converter, and sometimes even when installing a highflow catalytic converter.